HI! I know I must replace my power supply unit in my Dell Precision 486/33 which was upgraded to a 486dx66Mhz with a larger H.D and an AMD cpu last year. Some people have told me to put a power supply unit (PSU) that is 250watts or greater, but when i see Dell's proprietary PSU it states it's 224 watts. If I put in a 250 or greater watt PSU, will my system be damaged??? I also want more suggestions on PSU brand names and sources. I want the fan to be trustworthy. Thank YOU